Click here to install the MuPDF Plug-in for Firefox on Windows.
This plug-in uses the incredible rendering power of Fitz and MuPDF to make PDF documents appear as normal web pages within your browser.
You may have to tell Firefox to allow the plugin install by adding ccxvii.net as a trusted site. Just click on the link, and then follow the instructions from the pop-up bar that appears at the top of the page. You may need to restart Firefox before PDF documents will appear normally inside Firefox.